Best thing BT could do ...
... would be to sell the business back to David Atherton for a fiver. If it's still worth that much.
I used to be a very regular customer, in fact we rarely bought from anybody else.
I stopped buying when I found that although I could log on at dabs.com and see good prices, it wouldn't let me buy at those prices. Oh no, it recognised us as a business customer and therefore checkout had to be done through BT Business Direct not through Dabs. But as soon as it transferred my basket to BT, the prices had mysteriously become close on 15% higher.
I don't do business with dishonest suppliers, and a company that expects business customers to pay 15% more than private customers for no benefit whatsoever is in my opinion the height of dishonesty.